The American party welcomed the immigrants from Germany and Ireland. They offered them refuge and at the same time, allowed them to work in America. The immigrants were a strong workforce during the middle of 1800's. They built canals and railroads.<span />
Answer:
True
Explanation:
During the late 1950s and early 1960s, Werner Arber and several others extended the work of an earlier Nobel laureate, Salvador Luria, who observed that bacteriophages (viruses that infect bacteria) not only induce hereditary mutations in their bacterial hosts but at the same time undergo hereditary mutations themselves. Werner Arber’s research was concentrated on the action of protective enzymes present in the bacteria, which modify the DNA of the infecting virus e.g., the restriction enzyme, so-called for its ability to restrict the growth of the bacteriophage by cutting the molecule of its DNA to pieces.
Answer:
Federalism has evolved over the course of American history. ... Because the powers rarely overlapped, dual federalism is also known as 'layer cake' federalism. Dual federalism was used in this country for a long time. However, by the 1930s, 'layer cake' federalism began to morph into 'marble cake' federalism.
More Americans were now able to move to the suburbs.
Population growth after World War II was a cause of expansion of cities into suburbs. The prices of homes in suburbs were more affordable to middle class families, due to lower land prices and new building practices like tract housing. With the growth of the suburbs, improvement of roadways became a priority. The Federal-Aid Highway Act passed in 1956 advanced and enabled further growth of the suburbs surrounding city centers.
